Submissions for variant NM_000431.4(MVK):c.14T>C (p.Val5Ala)

gnomAD frequency: 0.00004  dbSNP: rs141765653

Total submissions: 6

Submitter	RCV	SCV	Clinical significance	Condition	Last evaluated	Review status	Method	Comment
GeneDx	RCV000220987	SCV000279114	uncertain significance	not provided	2015-12-31	criteria provided, single submitter	clinical testing	To our knowledge, the V5A variant has not been published as a pathogenic variant, nor has it been reported as a benign variant. It was not observed in approximately 6,500 individuals of European and African American ancestry in the NHLBI Exome Sequencing Project, indicating it is not a common benign variant in these populations. V5A is a conservative amino acid substitution, which is not likely to impact secondary protein structure as these residues share similar properties. This substitution occurs at a position that is not conserved across species. However, in-silico analysis predicts this variant likely does not alter the protein structure/function. Missense variants in nearby residues (M1L/I, A10V) have been reported in the Human Gene Mutation Database in association with MVK-related disorders (Stenson et al., 2014), supporting the functional importance of this region of the protein. Therefore, based on the currently available information, it is unclear whether this variant is a pathogenic change or a rare benign variant.
Labcorp Genetics (formerly Invitae), Labcorp	RCV001052087	SCV001216278	uncertain significance	Mevalonic aciduria; Porokeratosis 3, disseminated superficial actinic type; Hyperimmunoglobulin D with periodic fever	2024-08-28	criteria provided, single submitter	clinical testing	This sequence change replaces valine, which is neutral and non-polar, with alanine, which is neutral and non-polar, at codon 5 of the MVK protein (p.Val5Ala). This variant is present in population databases (rs141765653, gnomAD 0.007%). This variant has not been reported in the literature in individuals affected with MVK-related conditions. ClinVar contains an entry for this variant (Variation ID: 234376). Invitae Evidence Modeling of protein sequence and biophysical properties (such as structural, functional, and spatial information, amino acid conservation, physicochemical variation, residue mobility, and thermodynamic stability) indicates that this missense variant is not expected to disrupt MVK protein function with a negative predictive value of 95%. In summary, the available evidence is currently insufficient to determine the role of this variant in disease. Therefore, it has been classified as a Variant of Uncertain Significance.
Illumina Laboratory Services, Illumina	RCV001110713	SCV001268182	uncertain significance	Hyperimmunoglobulin D with periodic fever	2018-01-13	criteria provided, single submitter	clinical testing	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease.
Illumina Laboratory Services, Illumina	RCV001112691	SCV001270380	uncertain significance	Mevalonic aciduria	2018-01-13	criteria provided, single submitter	clinical testing	This variant was observed in the ICSL laboratory as part of a predisposition screen in an ostensibly healthy population. It had not been previously curated by ICSL or reported in the Human Gene Mutation Database (HGMD: prior to June 1st, 2018), and was therefore a candidate for classification through an automated scoring system. Utilizing variant allele frequency, disease prevalence and penetrance estimates, and inheritance mode, an automated score was calculated to assess if this variant is too frequent to cause the disease. Based on the score, this variant could not be ruled out of causing disease and therefore its association with disease required further investigation. A literature search was performed for the gene, cDNA change, and amino acid change (if applicable). No publications were found based on this search. This variant was therefore classified as a variant of unknown significance for this disease.
Baylor Genetics	RCV001112691	SCV001521440	uncertain significance	Mevalonic aciduria	2019-12-02	criteria provided, single submitter	clinical testing	This variant was determined to be of uncertain significance according to ACMG Guidelines, 2015 [PMID:25741868].
Genome Diagnostics Laboratory, The Hospital for Sick Children	RCV002262823	SCV002542323	uncertain significance	Autoinflammatory syndrome	2021-03-23	criteria provided, single submitter	clinical testing